// JavaScript Document
jQuery.extend({

    createUploadIframe: function(id, uri) {
        //create frame
        var frameId = 'jUploadFrame' + id;

        // if(window.ActiveXObject) {
        // 	if(jQuery.browser.version=="9.0") {
        // 		io = document.createElement('iframe');
        // 		io.id = frameId;
        // 		io.name = frameId;
        // 	} else if(jQuery.browser.version=="6.0"||jQuery.browser.version=="7.0"||jQuery.browser.version=="8.0") {
        // 		var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
        //         if(typeof uri== 'boolean'){
        //             io.src = 'javascript:false';
        //         }
        //         else if(typeof uri== 'string'){
        //             io.src = uri;
        //         }
        // 	}
        // }


        if (window.ActiveXObject) {
            if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            } else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if (typeof uri == 'boolean') {
                    io.src = 'javascript:false';
                } else if (typeof uri == 'string') {
                    io.src = uri;
                }
            }
        } else {
            var io = document.createElement('iframe');
            io.id = frameId;
            io.name = frameId;
        }
        io.style.position = 'absolute';
        io.style.top = '-1000px';
        io.style.left = '-1000px';

        document.body.appendChild(io);

        return io;
    },
    createUploadForm: function(id, fileElementId) {
        //create form 
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
        var oldElement = jQuery('#' + fileElementId);
        var newElement = jQuery(oldElement).clone(true);
        jQuery(oldElement).attr('id', fileId);
        jQuery(oldElement).before(newElement);
        jQuery(oldElement).appendTo(form);
        //set attributes
        jQuery(form).css('position', 'absolute');
        jQuery(form).css('top', '-1200px');
        jQuery(form).css('left', '-1200px');
        jQuery(form).appendTo('body');
        return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = s.fileElementId;
        var form = jQuery.createUploadForm(id, s.fileElementId);
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;

        if (s.global && !jQuery.active++) {
            // Watch for a new set of requests
            jQuery.event.trigger("ajaxStart");
        }
        var requestDone = false;
        // Create the request object
        var xml = {};
        if (s.global) {
            jQuery.event.trigger("ajaxSend", [xml, s]);
        }

        var uploadCallback = function(isTimeout) {
                // Wait for a response to come back 
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;

                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {
                            // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType);
                            if (s.success) {
                                // ifa local callback was specified, fire it and pass it the data
                                s.success(data, status);
                            };
                            if (s.global) {
                                // Fire the global callback
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                            };
                        } else {
                            jQuery.handleError(s, xml, status);
                        }

                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    };
                    if (s.global) {
                        // The request was completed
                        jQuery.event.trigger("ajaxComplete", [xml, s]);
                    };


                    // Handle the global AJAX counter
                    if (s.global && !--jQuery.active) {
                        jQuery.event.trigger("ajaxStop");
                    };
                    if (s.complete) {
                        s.complete(xml, status);
                    };

                    jQuery(io).unbind();

                    setTimeout(function() {
                        try {
                            jQuery(io).remove();
                            jQuery(form).remove();

                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }

                    }, 100);

                    xml = null;

                };
            }
            // Timeout checker
        if (s.timeout > 0) {
            setTimeout(function() {

                if (!requestDone) {
                    // Check to see ifthe request is still happening
                    uploadCallback("timeout");
                }

            }, s.timeout);
        }
        try {
            var form = jQuery('#' + formId);
            jQuery(form).attr('action', s.url);
            jQuery(form).attr('method', 'POST');
            jQuery(form).attr('target', frameId);
            if (form.encoding) {
                form.encoding = 'multipart/form-data';
            } else {
                form.enctype = 'multipart/form-data';
            }
            jQuery(form).submit();

        } catch (e) {
            jQuery.handleError(s, xml, null, e);
        }
        if (window.attachEvent) {
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        } else {
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }
        return { abort: function() {} };

    },

    uploadHttpData: function(r, type) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // ifthe type is "script", eval it in global context
        if (type == "script") {
            jQuery.globalEval(data);
        }

        // Get the JavaScript object, ifJSON is used.
        if (type == "json") {
            eval("data = " + data);
        }

        // evaluate scripts within html
        if (type == "html") {
            jQuery("<div>").html(data).evalScripts();
        }

        return data;
    },
    handleError: function(s, xhr, status, e) {
        // If a local callback was specified, fire it
        if (s.error) {
            s.error.call(s.context || s, xhr, status, e);
        }

        // Fire the global callback
        if (s.global) {
            (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
        }
    }
});